Cast Iron Gear
Custom cast iron gears made from gray cast iron and ductile cast iron. Accuracy Grade: ISO/DIN/GB Class 5. Diameter: 3 mm – 300 mm. MOQ: 5 pieces.
Sango CNC is one of the most reliable manufacturers and suppliers of cast iron gears in China. With abundant experience, we warmly welcome you to wholesale advanced cast iron gears made in China from our factory. Good service and quality products are available.
One-Stop Gear Manufacturing Factory
Since its establishment in 2010, Sango CNC has been deeply involved in the field of mechanical transmission and has rich experience in the research, development, and production of precision reducers and precision gears.
We have provided customized gear and drivetrain services for tobacco packaging equipment, food packaging equipment, and other equipment manufacturers. Customized products include cast iron gears, metal planetary gears, and precision gearboxes. By choosing us, you can get the most suitable quote for your project.
Gear Specifications
Why Machine Builders Specify It
Cast iron gears have different characteristics depending on the cast iron material chosen.
Good Abrasion Resistance
Cast iron contains graphite, which is lubricating. It forms a lubricating film during friction in the cast iron gear, improving the gear's wear resistance.
Good Shock Absorption
The graphite in cast iron absorbs mechanical vibration energy and hinders vibration propagation. This gives cast iron gears good shock absorption and reduces noise during operation.
Lower Cost
Cast iron costs less than stainless steel, copper alloys, and other materials. Because it contains graphite, it also cuts better, with little tool wear during processing, so both material and processing costs are lower.
Performance Parameters
Main performance parameters for cast iron gears, set according to your actual working conditions.
Cast Iron Gear Performance Parameters
When producing cast iron gears, the specific performance parameters are determined according to the customer's actual working conditions. The table shows the main performance parameters for your reference.
| Engineering Parameter | Standard Range | Material & Application Notes |
|---|---|---|
| Diameter Range | 3 mm – 300 mm | Small diameter (<20 mm): ductile iron is often used. Medium and large diameter: suitable for all types of cast iron; gray cast iron is mostly found in large low-speed gears. |
| Tooth Type | Straight, Helical, Bevel, Internal | Straight: common. Helical: smooth, low noise, high load. Bevel: intersecting shaft drives (ductile iron). Internal: compact structure. |
| Modulus Range | 0.1 mm – 5.0 mm | Applicable Standards: ISO 1328, DIN 3962, GB/T 10095 |
| Accuracy & Strength | ISO/DIN/GB Level 6 (after finishing) | Tensile: Gray iron 150–350 MPa, Ductile iron 400–800 MPa. Hardness: Gray 170–250 HB, Ductile 170–300 HB. |
| Surface Treatment | Phosphating, Blackening, Quenching, Galvanized/Nickel | Selected to suit specific working conditions. |
Six mounting orientations
The same frame can be bolted base-down, wall mounted or inverted, and the motor can sit above, behind or in line. Quote the code with your order so the unit ships with the oil level and breather set for that orientation.
Base down, output up
Standard dial-table orientation.
Base down, output side
Right-angle output for wheel drives.
Wall mount, output horizontal
Saves floor space on narrow frames.
Inverted, output down
Overhead carrier and gantry work.
Motor top-mounted
Gearmotor stacked over the housing.
Motor rear-mounted
In-line drive for shallow installations.
Production & Service Procedure
Every cast iron gear follows five production steps, from casting the blank to final inspection against your drawing.
Production Procedure
Make Blanks
Based on your gear drawings, we design and manufacture the mold, sand cast the gear blanks in volume, check them for defects, and select only defect-free blanks for rough machining.
Rough Machining
Turning, drilling, tapping, and gear hobbing create the positioning reference and gear shape. At this stage, the gear does not yet meet the required precision, accuracy, and roughness, so further operations follow.
Heat Treatment
Heat treatment improves strength, hardness, and wear resistance. Depending on the material and your needs, we choose annealing, normalizing, or surface quenching.
Finishing
After heat treatment, the gear has not yet reached ISO Level 6. Finishing and gear grinding correct the error so the gear accuracy reaches ISO Level 6.
Surface Treatment & Inspection
We select the right surface treatment for your working conditions to improve rust and wear resistance. Gears are then inspected on gear inspection machines, CMMs, and other equipment to confirm every parameter meets your drawing.
Industries That Use Cast Iron Gears
Our customized cast iron gears and drivetrains serve tobacco packaging equipment, food packaging equipment, and other machinery manufacturers. Gray cast iron gears suit low-speed, light-load, impact-free drives and large low-speed gears. Ductile iron gears handle medium to heavy loads with some impact, and are a common choice for bevel gears on intersecting shaft drives. Alloy cast iron gears are used where high wear resistance, corrosion resistance, or high-temperature operation is needed.
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Frequently Asked Questions.
Everything you need to know about cast iron gears: materials, sizes, standards, and treatments.
